Investment vibrator



July 11, 1933. w J CLARK 1,918,018

INVESTMENT VIBRATOR Filed June 5, 1931 ITDIQTLET- wi f [107% M w, ,JmM/MW Patented July 11, 1933 eiao a tJNjT Ep TSTATES rATENT "OFFICE WALTER- ;r. CLARK, orionzcaeaitrrnors,

ass eivon 'ro con taionaronins Inc, or

CHICAGO, tumors, A oonronA'rroiv, or ILLINOIS V iNVESTMELiT vnaimron Application fiiea June 5, 1931. Serial no.;542,457.

This invention relates generally to a vibrator, and particularly of a typeadapted for use particularly'with dental investments, In

the ordinary method ofconstruc'ting molds for dental plates," inlay fillings, and other oralrestorations it is usual to form a'vvax pattern by impressing it into the cavity to be filled, in the case of inlay fillings for example, and to apply to that patternsome form of thin primary coating otdental in.- vesting material for the purpose of securing a smooth casting, followed by an investment or coarser or stronger material. It is essential that this thin primary coating of dental investing material be very uniformly applied, and in the past it has been usualto apply these primary It is one of the objects of the present in vention to provide a vibrating machine which is so constructed as v j p less and which transmits no vlbrations'to the table orbenchupon which it rests. :This is accomplished, in the 'enibodiment of' the in'- vention herein'illustrated, by mounting the vibrator unit in a rather heavy base; The high inertia of the base prevents vibration thereof at the rather high frequencyof vibra tion of the vibrator.

Another object isfthe provision of vi--' brating device which is conveniently portable and in which attachment to a work bench, 7

table or the like is eliminated.

It is a further object of the present invention to provide a vibrator ot the class described with avibratingdisk so constructed.

that vibrations varying from an almost im-,

perceptible movementto violent tappings maybe obtained. The disk is made prefcoatings a small amount at a time, gently shaking or tapping the wax finally taug the to be substantiallynoisea pin carried by the stem 12'.

erably of rubber, although 1 other substances may be used, and is thickest'at the center and very thin at the rim. Itan object is held against the vibrating disk at the rim the 7 object is vibrated 'lightly the magnitude of the f vibrations increasing as brought closer to the thick center portion of the-disk... I I V Other objects vcntionjwill appear to those skilled in the art after a consideration of; the following description- IGflQl' in conjunction with the accompanying drawing inwhich z Figure 1 is a top plan View of my improved vibrator. r

F1gu're2 1s a sectional view taken on the liner, a -+2 of 1* igure .1, the v brator being shown in elevation.

Figure 3 is asoctional View taken on the line of Figure 51, and showing an, in

vesiment bowl imposition to be vibrated. 1 I

the object and advantages of my in- Aheavy base member 1 is provided with an n interior recess or chamber 2 which is open at tne bottom, and a thickened or, wid enedbottom'portion 3 sloping 'outwardlyfrom each side of the base member, the latter construction materially increasing the weight and inertia of the heavy base member.

The base member 11s provided with an aperture 1 through which extend the leads 5" 6, SQOWD iniFigure Qasof the usual tumbler ype. Mounted within the recess 2 is a magnet coil 7 havingan iron core8, said coil be ing connected'to the switch 6,. :The magnet is provided with anarmature 1O resiliently mounted, as by. a spring member 11, in proximity to the poles of the iron core. ,Fixed to the armature 10 is a; threaded stem 12 ex; tendingupwardly through an aperture 13 in the top part of the base member 1. I A vibrator disc 14 of rubber or other suitable elastic material is provided with a 5- having a head embedded therein and a threaded. extension received within and. As is clearirom-Fig ure 3 the vibrator disc 14 is provided with a thin peripheral 'tral portion 17, fora purpose to be described .80 which are connected to a switch mechanism edge 16 anda thickened ceni so as to be able to'hold objects thereon by suction.

the corner thereof Wltll rubber foot members 18 which serve as cushion supports for The base member 1 is provided at the base member. The coil 7 is secured to the base member 1 by an angle plate 19 and screws 20.

In the normal operation of my device th leads are connected to a source of alternating current so that when the switch 6 is ac tuated to close the circuit, the armature will be set into vibration. The rubber vibrator disc 14, which is carried bythe armature 10, will be correspondingly vibrated, and hence-any object placed thereon will be also vibrated. b

F or example, Figure? shows a hard rubber bowl 21 carried by the vibrator disc 14 and containing a mass of investment-plaster 22.; Preferably, the plaster and bowl is shaken first by hand and then placedon the vibrator disc 14 for a final vibration whereby the plaster is compacted and freed of air bubbles.

In the case of inlay fillings the Wax inlay pattern is mounted on a sprue former, and after the pattern is given an initial application of the primary investing material it is held in contact with the vibrator button 14 so as to-be vibrated thereby in orderthat the investing material maybe spread uniformly over the pattern. This investing material is applied in'the form of a powder or a paint.

"- In cases where only li ht vibrations are desired, the wax pattern and attached sprue former are held 1n contact With the extreme peripheral edge of the vibrator d1sc. This edge, as described above, is thin so that the.

" vibrations transmitted are light. In cases of largerpatterns, for example, where it is desired that the vibrationshould be comparatively heavy, the pattern is held in contact with the vibrator disc at the central portion thereof, this being the thickened part referred to above.

Figure 2 shows how an inlay pattern 23 with sprue former 24 can be held against the edge of the disc 14 and receive light vibra.

'tions therefrom.

This feature of being able to apply to the pattern either light or heavy vibration is of great importance in this art, since there is little possibility of knocking loose these sprue r formers. It is clearthat by shifting these patterns fromthe center to the edge of the vibrator disc 14 any desired degree of vibration may be had. Obviously, if alternating my name this 1. A vibrator comprising, a heavy base member having integral top and side walls, the top wall having an opening therethrough and the latterbeing, thickened along the lower portions thereof to increase the weight of the base member, vibrator mechanism mounted within the base member and in eluding an armature disposed generally above the thickened portions of the side Walls and having a portion projecting upwardly through the oening in said integral top wall,,-a flexible discmounted on said projecting portion andhaving a varying cross-sec tion whereby variation in. intensity of vibration is produced at different points OIl'lZllG I surface of the disc, and foot portions carried by the thickened sections oftsa'id side walls. A vibrator comprising a base member having an interior recess, vibrating mechanism mountedin said recess, said mechanism having aprojecting portion extending through the top of said base member, and a flexible disc secured to said projecting portion, said disc having a thickenedlcentral portion for transmitting relatively heavy vibration and a. thin peripheral portion for transmitting relatively light vibrations. V -3. A vibrator comprising a base member having an interior recess, vibratingme'chaa nism mounted Within said recess mcluding an electromagnetically'actuated member'hav ing a pro ecting portion extending through said base member, a., switch mounted inthe side Wallofsaidmember for controlling said vibrating mechanism, a flexible disc having a thickened central section and a relatively thin peripheral section for transmitting relatively heavy and light yibrations, respec-' tively, and'a pin member embedded centrally in said disc andengaging in the projecting portion of said vibrating mechanism.

In witness whereof, I' hereunto subscribe 16th day of-May, 1931.

.. .WA'LTEB J. CLARK. 

